condition mean min max ZT0-3 60.760216666666665 54.44215 68.027 ZT4-7 65.43504999999999 65.43504999999999 65.43504999999999 ZT8-11 76.8274 76.8274 76.8274 ZT12-15 90.06717499999999 88.5906 91.54374999999999 ZT16-19 76.23 76.23 76.23 ZT20-23 57.4748 57.4748 57.4748